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Sunflowers make small moves to maximize their Sun exposure – physicists can model them to predict how they grow
Charles Darwin’s detailed observations of plant movements, such as sunflower circumnutation and self-organization, reveal how randomness helps plants optimize growth and adapt to their environments. Sunflowers!
Last Updated on September 18, 2024 by Daily News Staff
Chantal Nguyen, University of Colorado Boulder
Most of us aren’t spending our days watching our houseplants grow. We see their signs of life only occasionally – a new leaf unfurled, a stem leaning toward the window.
But in the summer of 1863, Charles Darwin lay ill in bed, with nothing to do but watch his plants so closely that he could detect their small movements to and fro. The tendrils from his cucumber plants swept in circles until they encountered a stick, which they proceeded to twine around.
“I am getting very much amused by my tendrils,” he wrote.
This amusement blossomed into a decadeslong fascination with the little-noticed world of plant movements. He compiled his detailed observations and experiments in a 1880 book called “The Power of Movement in Plants.”
In one study, he traced the motion of a carnation leaf every few hours over the course of three days, revealing an irregular looping, jagged path. The swoops of cucumber tendrils and the zags of carnation leaves are examples of inherent, ubiquitous plant movements called circumnutations – from the Latin circum, meaning circle, and nutare, meaning to nod.
Circumnutations vary in size, regularity and timescale across plant species. But their exact function remains unclear.
I’m a physicist interested in understanding collective behavior in living systems. Like Darwin, I’m captivated by circumnutations, since they may underlie more complex phenomena in groups of plants.
Sunflower patterns
A 2017 study revealed a fascinating observation that got my colleagues and me wondering about the role circumnutations could play in plant growth patterns. In this study, researchers found that sunflowers grown in a dense row naturally formed a near-perfect zigzag pattern, with each plant leaning away from the row in alternating directions.
This pattern allowed the plants to avoid shade from their neighbors and maximize their exposure to sunlight. These sunflowers flourished.
Researchers then planted some plants at the same density but constrained them so that they could grow only upright without leaning. These constrained plants produced less oil than the plants that could lean and get the maximum amount of sun.
While farmers can’t grow their sunflowers quite this close together due to the potential for disease spread, in the future they may be able to use these patterns to come up with new planting strategies.
Self-organization and randomness
This spontaneous pattern formation is a neat example of self-organization in nature. Self-organization refers to when initially disordered systems, such as a jungle of plants or a swarm of bees, achieve order without anything controlling them. Order emerges from the interactions between individual members of the system and their interactions with the environment.
Somewhat counterintuitively, noise – also called randomness – facilitates self-organization. Consider a colony of ants.
Ants secrete pheromones behind them as they crawl toward a food source. Other ants find this food source by following the pheromone trails, and they further reinforce the trail they took by secreting their own pheromones in turn. Over time, the ants converge on the best path to the food, and a single trail prevails.
But if a shorter path were to become possible, the ants would not necessarily find this path just by following the existing trail.
If a few ants were to randomly deviate from the trail, though, they might stumble onto the shorter path and create a new trail. So this randomness injects a spontaneous change into the ants’ system that allows them to explore alternative scenarios.
Eventually, more ants would follow the new trail, and soon the shorter path would prevail. This randomness helps the ants adapt to changes in the environment, as a few ants spontaneously seek out more direct ways to their food source.
In biology, self-organized systems can be found at a range of scales, from the patterns of proteins inside cells to the socially complex colonies of honeybees that collectively build nests and forage for nectar.
Randomness in sunflower self-organization
So, could random, irregular circumnutations underpin the sunflowers’ self-organization?
My colleagues and I set out to explore this question by following the growth of young sunflowers we planted in the lab. Using cameras that imaged the plants every five minutes, we tracked the movement of the plants to see their circumnutatory paths.
We saw some loops and spirals, and lots of jagged movements. These ultimately appeared largely random, much like Darwin’s carnation. But when we placed the plants together in rows, they began to move away from one another, forming the same zigzag configurations that we’d seen in the previous study.
We analyzed the plants’ circumnutations and found that at any given time, the direction of the plant’s motion appeared completely independent of how it was moving about half an hour earlier. If you measured a plant’s motion once every 30 minutes, it would appear to be moving in a completely random way.
We also measured how much the plant’s leaves grew over the course of two weeks. By putting all of these results together, we sketched a picture of how a plant moved and grew on its own. This information allowed us to computationally model a sunflower and simulate how it behaves over the course of its growth.
A sunflower model
We modeled each plant simply as a circular crown on a stem, with the crown expanding according to the growth rate we measured experimentally. The simulated plant moved in a completely random way, taking a “step” every half hour.
We created the model sunflowers with circumnutations of lower or higher intensity by tweaking the step sizes. At one end of the spectrum, sunflowers were much more likely to take tiny steps than big ones, leading to slow, minimal movement on average. At the other end were sunflowers that are equally as likely to take large steps as small steps, resulting in highly irregular movement. The real sunflowers we observed in our experiment were somewhere in the middle.
Plants require light to grow and have evolved the ability to detect shade and alter the direction of their growth in response.
We wanted our model sunflowers to do the same thing. So, we made it so that two plants that get too close to each other’s shade begin to lean away in opposite directions.
Finally, we wanted to see whether we could replicate the zigzag pattern we’d observed with the real sunflowers in our model.
First, we set the model sunflowers to make small circumnutations. Their shade avoidance responses pushed them away from each other, but that wasn’t enough to produce the zigzag – the model plants stayed stuck in a line. In physics, we would call this a “frustrated” system.
Then, we set the plants to make large circumnutations. The plants started moving in random patterns that often brought the plants closer together rather than farther apart. Again, no zigzag pattern like we’d seen in the field.
But when we set the model plants to make moderately large movements, similar to our experimental measurements, the plants could self-organize into a zigzag pattern that gave each sunflower optimal exposure to light.
So, we showed that these random, irregular movements helped the plants explore their surroundings to find desirable arrangements that benefited their growth.
Plants are much more dynamic than people give them credit for. By taking the time to follow them, scientists and farmers can unlock their secrets and use plants’ movement to their advantage.
Chantal Nguyen, Postdoctoral Associate at the BioFrontiers Institute, University of Colorado Boulder
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Last Updated on March 2, 2026 by Daily News Staff
Early risers in Arizona are in for a celestial show.
On Tuesday, March 3, 2026, a total lunar eclipse will be visible across much of North America — including Phoenixand the Valley. During this event, the Moon will pass completely into Earth’s shadow, turning a deep copper-red color often called a “Blood Moon.”
Here’s what you need to know.
🌍 What Is a Total Lunar Eclipse?
A total lunar eclipse happens when the Sun, Earth, and Moon align perfectly, with Earth positioned directly between the Sun and the Moon. As the Moon moves into Earth’s darkest shadow (the umbra), it doesn’t disappear — instead, it glows red.
That reddish color comes from sunlight filtering through Earth’s atmosphere — essentially, we’re seeing all the world’s sunrises and sunsets projected onto the Moon at once.
🕒 Phoenix Viewing Times (MST)
Arizona does not observe Daylight Saving Time in March, so these times are in Mountain Standard Time (MST).
- 1:44 a.m. – Penumbral eclipse begins (subtle dimming begins)
- 2:50 a.m. – Partial eclipse begins (Earth’s shadow becomes clearly visible)
- 4:04 a.m. – Totality begins 🌕
- 4:34 a.m. – Greatest eclipse
- 5:03 a.m. – Totality ends
- 6:18 a.m. – Partial eclipse ends
- 7:20 a.m. – Penumbral eclipse ends
The most dramatic portion — totality — lasts nearly one hour.
🌅 Where to Look in Phoenix
The eclipse happens in the pre-dawn hours, so the Moon will be low in the western sky as it sets.
For the best view:
- Find a location with a clear western horizon
- Avoid city light glare if possible
- Consider desert viewpoints, parks, or elevated areas around the Valley
Because the Moon will be setting as the Sun begins to rise, the backdrop of early morning twilight could make for stunning photography.
🔭 Do You Need Special Equipment?
No.
Unlike a solar eclipse, lunar eclipses are completely safe to view with the naked eye. However:
- Binoculars enhance color detail
- A small telescope reveals subtle shadow gradients
- A tripod and DSLR or smartphone with night mode can capture impressive images
🌎 Why This Eclipse Matters
This will be one of the most accessible celestial events of 2026 for Arizona residents. Total lunar eclipses don’t happen every year in the same location, and the timing — just before sunrise — adds dramatic visual contrast.
If skies are clear, Phoenix could have a spectacular view.
📌 Quick Viewing Reminder for Phoenix
Set your alarm for around 3:45 a.m.
Step outside by 4:00 a.m.
Look west
Watch the Moon turn red
No tickets. No crowds. Just the sky putting on a show.
For more science, space, and Arizona skywatching coverage, visit STM Daily News.
Related Coverage
- NASA: What Is a Lunar Eclipse?
- Time and Date: March 3, 2026 Total Lunar Eclipse Details
- Sky & Telescope: How to Watch the March 2026 Lunar Eclipse
- Space.com: Where and When to See the 2026 Blood Moon
- STM Daily News – Science & Space Coverage
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The Knowledge
Brightline West Nears Final Environmental Clearance Milestone
Brightline West’s final environmental assessment is 99% complete, clearing a major hurdle for the high-speed rail line connecting Southern California and Las Vegas.
Last Updated on March 1, 2026 by Daily News Staff
The long-awaited high-speed rail connection between Southern California and Las Vegas just hit a major milestone.
According to recent reports, the final environmental assessment for Brightline West is now 99% complete — signaling that one of the most critical regulatory hurdles for the project is nearly finished.
For a project that has been discussed for over a decade, this is significant progress.
What “99% Complete” Really Means
Before major infrastructure projects like high-speed rail can move into full construction, they must go through extensive federal environmental review under the National Environmental Policy Act (NEPA).
For Brightline West, this includes:
- Environmental impact evaluations
- Wildlife and habitat assessments
- Air quality studies
- Noise and vibration analysis
- Cultural and tribal consultations
- Traffic and community impact reviews
Reaching 99% completion means the overwhelming majority of those studies, revisions, and agency approvals are essentially done. In practical terms, the project is nearly clear of its final federal environmental review requirements.
That’s a huge step toward full-scale construction.
The Route: Southern California to Las Vegas
Brightline West will run approximately 218 miles largely within the median of Interstate 15, connecting:
- Las Vegas
- Apple Valley
- Hesperia
- Rancho Cucamonga (with connections to Metrolink toward Los Angeles)
Trains are designed to reach speeds up to 200 mph, cutting travel time between Southern California and Las Vegas to roughly 2 hours.
Instead of battling I-15 weekend traffic, travelers could board a train in Rancho Cucamonga and arrive on the Las Vegas Strip in about the time it currently takes just to get through the Cajon Pass on a busy Friday.
Construction Status
The project officially broke ground in 2024, and early work has included:
- Geotechnical testing
- Land surveying
- Utility relocation
- Pre-construction corridor preparation
While heavy civil construction has not yet fully ramped up across the entire route, completing environmental clearance removes one of the last major barriers before large-scale building accelerates.
Timeline Update
The original goal was to open before the 2028 Los Angeles Olympics. That timeline has shifted.
Current projections place passenger service around late 2029, depending on construction pace and financing milestones.
Why This Milestone Matters
High-speed rail projects in the United States often stall due to environmental review delays, funding gaps, or regulatory challenges.
Getting to 99% completion on final environmental assessment means:
- Federal review is nearly wrapped
- Legal vulnerability is reduced
- Major construction can proceed with more certainty
- Investor confidence improves
For Southern California and Nevada, it represents real forward momentum.
The Bigger Picture
Brightline West is privately developed, separate from California’s state high-speed rail system. If completed as planned, it would become one of the first true high-speed rail lines operating in the western United States.
The I-15 corridor between Los Angeles and Las Vegas is one of the most heavily traveled leisure routes in the country. A successful rail alternative could significantly reshape travel patterns between the two regions.
Final Take
The headline may sound small — “99% complete” — but in infrastructure terms, it’s a major breakthrough.
With environmental review nearly finished, Brightline West is closer than ever to turning renderings into reality.
Now the question shifts from if the train gets built… to how fast construction can move from here.
Further Reading & Outside Coverage
- Brightline West Official Project Website
- Federal Railroad Administration (FRA)
- Las Vegas Review-Journal – Brightline West Coverage
- Los Angeles Times – Transportation & Infrastructure
- Progressive Railroading – Industry Updates
- Trains Magazine – Rail Industry News
- U.S. Department of Transportation
Dive into “The Knowledge,” where curiosity meets clarity. This playlist, in collaboration with STMDailyNews.com, is designed for viewers who value historical accuracy and insightful learning. Our short videos, ranging from 30 seconds to a minute and a half, make complex subjects easy to grasp in no time. Covering everything from historical events to contemporary processes and entertainment, “The Knowledge” bridges the past with the present. In a world where information is abundant yet often misused, our series aims to guide you through the noise, preserving vital knowledge and truths that shape our lives today. Perfect for curious minds eager to discover the ‘why’ and ‘how’ of everything around us. Subscribe and join in as we explore the facts that matter. https://stmdailynews.com/the-knowledge/
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Last Updated on February 28, 2026 by Daily News Staff
For decades, the idea of aliens visiting Earth has lived in a cultural no-man’s-land: too fascinating to ignore, too stigmatized to study seriously, and too easy to dismiss with a joke. But that posture has shifted in a measurable way over the past several years.
Physicist Kevin Knuth (University at Albany, SUNY) argued in a 2018 essay for The Conversation that the question of whether some UFO reports could represent something truly unknown is worthy of serious scientific study — not because we have proof of extraterrestrials, but because a small portion of cases appear to resist easy explanation and involve trained observers, multiple sensors, or unusual performance claims.
Article: https://theconversation.com/are-we-alone-the-question-is-worthy-of-serious-scientific-study-98843
That argument gained new oxygen in late 2017, when The New York Times reported that the U.S. Department of Defense had funded a program known as the Advanced Aerospace Threat Identification Program (AATIP). The reporting described roughly $22 million spent to examine military reports of unusual aerial incidents. Former Pentagon official Luis Elizondo became a central public figure in the story, saying he left his role amid frustration over secrecy and limited support for deeper investigation.
Around the same time, the Pentagon confirmed and released several now-famous military videos showing encounters recorded on forward-looking infrared (FLIR) systems from Navy aircraft — clips that reignited public debate and pushed the topic out of late-night-TV territory and into mainstream news.
What we’ve learned since (2018–2026)
The biggest “update” since your original post isn’t a single smoking gun. It’s the fact that the U.S. government and scientific institutions have increasingly treated the issue as a data and airspace-safety problem—and, potentially, a national security one.
A few key developments:
- The language changed: “UFO” has increasingly been replaced by UAP (Unidentified Anomalous Phenomena), a term meant to reduce stigma and widen the scope beyond “flying saucers.”
- Regular reporting became normalized: The Office of the Director of National Intelligence (ODNI) has issued public-facing UAP reporting in recent years, and the Department of Defense has continued formal tracking through dedicated offices.
- NASA stepped in: NASA convened an independent UAP study team, releasing a final report in 2023 that emphasized something simple but important: if you want answers, you need better data, consistent reporting standards, and transparent methods. (NASA’s stance was not “aliens confirmed,” but “this is a legitimate area for structured inquiry.”)
The Carl Sagan test still applies
Carl Sagan’s line remains the guardrail here:
“Extraordinary claims require extraordinary evidence.”
In other words: eyewitness testimony alone — even sincere testimony — isn’t enough. A personal story, a viral clip, or even a dramatic encounter doesn’t automatically equal proof of extraterrestrial visitation. If the claim is “non-human intelligence is visiting Earth,” the evidence has to be strong enough to survive serious scrutiny: repeatable analysis, multi-sensor confirmation, chain-of-custody, and independent review.
So where does that leave us?
If you strip away the hype, the most reasonable position in 2026 looks something like this:
- Something is being observed in a small percentage of cases that isn’t immediately identifiable.
- That does not automatically mean “aliens.”
- But it does mean the topic is no longer intellectually off-limits the way it once was.
After leaving AATIP-related work, Elizondo became associated with To The Stars Academy of Arts & Science, a group founded by musician Tom DeLonge that aimed to blend public interest, aerospace ideas, and advocacy for further investigation. Whether you view that effort as serious research, public outreach, or a media-adjacent project, it reflects the broader reality: the conversation has moved from fringe forums into public institutions.
The next step shouldn’t be louder claims. It should be better instrumentation, better reporting, and better science—because if there’s a prosaic explanation, rigorous study will reveal it. And if there’s something genuinely novel in the data, that’s exactly what science is for.
More STM Daily News science coverage: https://stmdailynews.com/category/science/
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